proxy_pass: more tests for giant headers and truncations

We need to ensure more uncommon cases such as gigantic upstream
headers and truncated upstream responses are handled properly
and predictably.

1 files changed, 6 insertions, 3 deletions

diff --git a/lib/yahns/proxy_http_response.rb b/lib/yahns/proxy_http_response.rb
index 31505d3..8f4790e 100644
--- a/lib/yahns/proxy_http_response.rb
+++ b/lib/yahns/proxy_http_response.rb
@@ -28,10 +28,13 @@ module Yahns::HttpResponse # :nodoc:
 
   def proxy_err_response(code, req_res, exc, wbuf)
     logger = @hs.env['rack.logger']
-    if exc
-      Yahns::Log.exception(logger, 'upstream error', exc)
-    else
+    case exc
+    when nil
       logger.error('premature upstream EOF')
+    when Kcar::ParserError
+      logger.error("upstream response error: #{exc.message}")
+    else
+      Yahns::Log.exception(logger, 'upstream error', exc)
     end
     # try to write something, but don't care if we fail
     Integer === code and